New MultiTreeView to allow left-click to drag a multi-selected group

svn: r15750

src/Simple/_SimpleTable.py

@@ -471,6 +471,7 @@ class SimpleTable(object):
             doc.end_paragraph()
         elif self.simpledoc.doc.type == "gtk":
             import gtk
+            from gui.widgets.multitreeview import MultiTreeView
             from ScratchPad import ScratchPadListView, ACTION_COPY
             from DdTargets import DdTargets
             buffer = self.simpledoc.doc.buffer
@@ -480,7 +481,7 @@ class SimpleTable(object):
                 sort_index = self.__columns.index(self.__sort_col)
             else:
                 sort_index = 0
-            treeview = gtk.TreeView()
+            treeview = MultiTreeView()
             treeview.enable_model_drag_source(gtk.gdk.BUTTON1_MASK,
                  [(DdTargets.HANDLE_LIST.drag_type, gtk.TARGET_SAME_WIDGET, 0)],
                                               gtk.gdk.ACTION_COPY)

src/gui/widgets/Makefile.am

@@ -14,6 +14,7 @@ pkgdata_PYTHON = \
 	linkbox.py \
 	menutoolbuttonaction.py \
 	monitoredwidgets.py \
+	multitreeview.py \
 	progressdialog.py \
 	shortlistcomboentry.py \
 	springseparator.py \

src/gui/widgets/multitreeview.py

@@ -0,0 +1,83 @@
+#
+# Gramps - a GTK+/GNOME based genealogy program
+#
+# Copyright (C) 2010  Doug Blank <doug.blank@gmail.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, 
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+
+# $Id: $
+
+"""
+An override to allow easy multiselections.
+"""
+
+import gtk
+
+#-------------------------------------------------------------------------
+#
+# MultiTreeView class
+#
+#-------------------------------------------------------------------------
+class MultiTreeView(gtk.TreeView):
+    '''
+    TreeView that captures mouse events to make drag and drop work properly
+    '''
+    def __init__(self):
+        super(MultiTreeView, self).__init__()
+        self.connect('button_press_event', self.on_button_press)
+        self.connect('button_release_event', self.on_button_release)
+        self.connect('key_press_event', self.key_press_event)
+        self.defer_select = False
+
+    def key_press_event(self, widget, event):
+        if event.type == gtk.gdk.KEY_PRESS:
+            if event.keyval == gtk.keysyms.Delete:
+                model, paths = self.get_selection().get_selected_rows()
+                # reverse, to delete from the end
+                paths.sort(key=lambda x:-x[0])
+                for path in paths:
+                    try:
+                        node = model.get_iter(path)
+                    except:
+                        node = None
+                    if node:
+                        model.remove(node)
+                return True
+
+    def on_button_press(self, widget, event):
+        # Here we intercept mouse clicks on selected items so that we can
+        # drag multiple items without the click selecting only one
+        target = self.get_path_at_pos(int(event.x), int(event.y))
+        if (target 
+            and event.type == gtk.gdk.BUTTON_PRESS
+            and not (event.state & (gtk.gdk.CONTROL_MASK|gtk.gdk.SHIFT_MASK))
+            and self.get_selection().path_is_selected(target[0])):
+            # disable selection
+            self.get_selection().set_select_function(lambda *ignore: False)
+            self.defer_select = target[0]
+
+    def on_button_release(self, widget, event):
+        # re-enable selection
+        self.get_selection().set_select_function(lambda *ignore: True)
+        
+        target = self.get_path_at_pos(int(event.x), int(event.y))	
+        if (self.defer_select and target 
+            and self.defer_select == target[0]
+            and not (event.x==0 and event.y==0)): # certain drag and drop
+            self.set_cursor(target[0], target[1], False)
+            
+        self.defer_select=False
+